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Smelting method of high-purity bearing steel

A smelting method and technology of purity, applied in the smelting field of high-end bearing steel, can solve the problems of high cost, high phosphorus and sulfur content of bearing steel, low purity of bearing steel, etc., and achieve low cost, low sulfur content and small size. Effect

Active Publication Date: 2018-10-09
CHONGQING MATERIALS RES INST
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Problems solved by technology

[0007] The object of the present invention is to provide a method for smelting high-purity bearing steel, which can solve the problems of low purity of bearing steel smelted by conventional methods, high phosphorus and sulfur content and high cost of bearing steel smelted by double vacuum method

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  • Smelting method of high-purity bearing steel
  • Smelting method of high-purity bearing steel
  • Smelting method of high-purity bearing steel

Examples

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Embodiment Construction

[0027] Example 1 Smelting 9Cr18Mo Stainless Bearing Steel

[0028] The first step: intermediate frequency furnace melting

[0029] Use 9Cr18Mo back charge and a small amount of scrap steel (low alloy steel such as Q235 with a weight percentage of about 15%) as the main raw materials, and use industrial pure metals (Cr, Mo, Mn, Al), elemental silicon and graphite carbon as raw materials for composition fine-tuning; once The slag formula is CaO: SiO 2 : Fe 2 o 3 :MnO:MgO=40:20:20:10:10, the secondary slag formula is CaO:Al 2 o 3 :CaF 2 :MgO:MnO=50:25:15:5:5.

[0030] Add 9Cr18Mo back charge, a small amount of scrap steel and primary slag, and power on to complete melting; try to keep the temperature as low as possible (1480-1550°C), stir for dephosphorization, then remove slag, and add secondary slag; increase the temperature of molten steel to 1550-1550°C 1610°C, sample and analyze the composition, add alloy elements to the standard composition and content of 9Cr18Mo acc...

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Abstract

The invention relates to a preparation method of high-purity bearing steel. The preparation method is characterized by performing bearing steel smelting through a dual smelting process, namely by adopting a process of intermediate frequency furnace (or electric furnace) smelting and vacuum self-consuming remelting. Compared with bearing steel smelted through a dual vacuum process, a bearing steel cast ingot smelted by the method has equivalent gas content, lower contents of phosphorus, sulfur and other harmful elements, less non-metallic inclusions, smaller size, more uniform distribution and higher cost performance. Shaft and bearing materials produced by the method can be used for precise electromechanical products having higher requirements for service life, reliability and other aspects.

Description

technical field [0001] The invention relates to a metal material, in particular to a method for smelting high-end bearing steel. Background technique [0002] The quality of bearing steel is mainly determined by its metallurgical quality, and smelting technology is the most critical technology in the production process of bearing steel. The content of harmful elements such as oxygen, titanium, nitrogen, phosphorus, sulfur and five harmful elements is a key indicator to measure the metallurgical quality of bearing steel. Domestic and foreign bearing steel research and development institutions and enterprises have long been committed to improving the purity of bearing steel. [0003] The application of extra-furnace refining technology in the production process of bearing steel has made a qualitative leap in the metallurgical quality of bearing steel, and it is now relatively mature. However, there are still some deficiencies in out-of-furnace refining, such as high gas conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/04C22B9/20
CPCC22B9/20C22C33/04
Inventor 何曲波王东哲唐瑞王金太喻峰
Owner CHONGQING MATERIALS RES INST
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